C8051F126-GQR - 50MHz 8051 MCU, 128KB Flash, 100-TQFP | Silicon Labs
料号： C8051F126-GQR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $21.8 | $218.00 |
| 100 | $19.2 | $1,920.00 |
| 500 | $17.4 | $8,700.00 |
| 1,000 | $15.6 | $15,600.00 |
C8051F126-GQR 概述
What is a mixed-signal 8051 microcontroller? An 8051 MCU is a single-chip computer based on Intel's classic MCS-51 instruction set, extended over decades with on-chip peripherals, flash, and RAM. Mixed-signal devices add analog peripherals (ADC, DAC, comparators, voltage reference) directly to the digital core, eliminating the need for external converters and shrinking BOM cost. The C8051F126 sits in the broader hierarchy: 8-bit MCU -> 8051 family -> mixed-signal SoC -> embedded controller. It is commonly used as a step-up from discrete analog signal conditioning plus external ADC designs in industrial and instrumentation applications. Compared with a Cortex-M0/M3 device, an 8051 core is slower code-favored only for low-cost portability; the F126's value comes from analog silicon density.
Key features include a pipelined 8051 core that executes 70% of instructions in 1-2 system clocks, a 2-cycle 16x16 MAC engine for DSP-style math, programmable gain amplifier (PGA) gain settings of 0.5/1/2/4/8/16 on the ADC inputs, and a data-dependent windowed interrupt for adaptive sampling. Communication interfaces typically span two UARTs, an SMBus-compatible I2C bus, and an SPI bus for external peripherals and controllers. The -GQR suffix indicates a lead-free, RoHS-compliant 100-pin TQFP reel-packaged grade. The original device's supply range is 2.7 V to 3.6 V, and the operating range is -40 C to +85 C.
The C8051F2 architecture centers on an analog-friendly pipeline, an on-chip 2.2 V reference, and programmable throughput. The optional on-chip PLL supports up to 480 MHz - higher throughput without speed loss. A 2-cycle 16x16 MAC engine accelerates DSP-style math. These specifications highlight durability for high-throughput DSP-style industrial control. Typical applications span precision data acquisition, process control loops, motor control feedback, optical networking modules, instrumentation front-ends, and embedded control systems. The 64 I/O plus device pins and memory density also enable mid-tier designs with adequate peripheral headroom. When designing with this device, ensure adequate decoupling at the supply pin (10uF bulk) per the digital core. The original code's flash legacy ensures portable migration from discrete silicon designs.
直接替换替代料： C8051F126-GQR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
C8051F124-GQR
✅ 直接替换📋 参考替代料（不在目录中）
C8051F125-GQR
✅ 直接替换📋 参考替代料（不在目录中）
C8051F127-GQR
✅ 直接替换📋 参考替代料（不在目录中）
C8051F130-GQR
✅ 直接替换📋 参考替代料（不在目录中）
C8051F131-GQR
✅ 直接替换📋 参考替代料（不在目录中）
C8051F126-GQR 最大额定值与电气特性
| Core | 8051 (CIP) |
| Core Width | 8-bit |
| 最大时钟频率 | 50 MHz (100 MIPS peak) |
| Program Memory Size | 128 KB (128K x 8) FLASH |
| RAM Size | 8.25 KB |
| Number of I/O Pins | 64 |
| ADC | 10-bit, 8-channel, 100 ksps SAR |
| DAC | 2 x 12-bit |
| Comparators | 2 |
| Timers | 5 x 16-bit |
| Supply Voltage (Vcc/Vdd) | 2.7 V to 3.6 V |
| 工作温度 | -40 C to +85 C |
| 封装 | 100-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Series | C8051F12x |
| RoHS 状态 | Compliant |
C8051F126-GQR 引脚配置
| 引脚 1 | P1.0 — Port 1 bit 0 (digital I/O) |
| 引脚 2 | P1.1 — Port 1 bit 1 (digital I/O) |
| 引脚 3 | P1.2 — Port 1 bit 2 (digital I/O) |
| 引脚 4 | P1.3 — Port 1 bit 3 (digital I/O) |
| 引脚 5 | P1.4 — Port 1 bit 4 (digital I/O) |
| 引脚 6 | P1.5 — Port 1 bit 5 (digital I/O) |
| 引脚 7 | P1.6 — Port 1 bit 6 (digital I/O) |
| 引脚 8 | P1.7 — Port 1 bit 7 (digital I/O) |
| 引脚 9 | P2.0 — Port 2 bit 0 (digital I/O) |
| 引脚 10 | P2.1 — Port 2 bit 1 (digital I/O) |
| 引脚 11 | P2.2 — Port 2 bit 2 (digital I/O) |
| 引脚 12 | P2.3 — Port 2 bit 3 (digital I/O) |
| 引脚 13 | P2.4 — Port 2 bit 4 (digital I/O) |
| 引脚 14 | P2.5 — Port 2 bit 5 (digital I/O) |
| 引脚 15 | P2.6 — Port 2 bit 6 (digital I/O) |
| 引脚 16 | P2.7 — Port 2 bit 7 (digital I/O) |
| 引脚 17 | P3.0 — Port 3 bit 0 (digital I/O) |
| 引脚 18 | P3.1 — Port 3 bit 1 (digital I/O) |
| 引脚 19 | P3.2 — Port 3 bit 2 (digital I/O / INT0) |
| 引脚 20 | P3.3 — Port 3 bit 3 (digital I/O / INT1) |
| 引脚 21 | P3.4 — Port 3 bit 4 (digital I/O / T0) |
| 引脚 22 | P3.5 — Port 3 bit 5 (digital I/O / T1) |
| 引脚 23 | P3.6 — Port 3 bit 6 (digital I/O) |
| 引脚 24 | P3.7 — Port 3 bit 7 (digital I/O) |
| 引脚 25 | P4.0 — Port 4 bit 0 (digital I/O) |
| 引脚 26 | P4.1 — Port 4 bit 1 (digital I/O) |
| 引脚 27 | P4.2 — Port 4 bit 2 (digital I/O) |
| 引脚 28 | P4.3 — Port 4 bit 3 (digital I/O) |
| 引脚 29 | P4.4 — Port 4 bit 4 (digital I/O) |
| 引脚 30 | P4.5 — Port 4 bit 5 (digital I/O) |
| 引脚 31 | P4.6 — Port 4 bit 6 (digital I/O) |
| 引脚 32 | P4.7 — Port 4 bit 7 (digital I/O) |
| 引脚 33 | P5.0 — Port 5 bit 0 (analog input AIN0) |
| 引脚 34 | P5.1 — Port 5 bit 1 (analog input AIN1) |
| 引脚 35 | P5.2 — Port 5 bit 2 (analog input AIN2) |
| 引脚 36 | P5.3 — Port 5 bit 3 (analog input AIN3) |
| 引脚 37 | P5.4 — Port 5 bit 4 (analog input AIN4) |
| 引脚 38 | P5.5 — Port 5 bit 5 (analog input AIN5) |
| 引脚 39 | P5.6 — Port 5 bit 6 (analog input AIN6) |
| 引脚 40 | P5.7 — Port 5 bit 7 (analog input AIN7) |
| 引脚 41 | P6.0 — Port 6 bit 0 (digital I/O) |
| 引脚 42 | P6.1 — Port 6 bit 1 (digital I/O) |
| 引脚 43 | P6.2 — Port 6 bit 2 (digital I/O) |
| 引脚 44 | P6.3 — Port 6 bit 3 (digital I/O) |
| 引脚 45 | P6.4 — Port 6 bit 4 (digital I/O) |
| 引脚 46 | P6.5 — Port 6 bit 5 (digital I/O) |
| 引脚 47 | P6.6 — Port 6 bit 6 (digital I/O) |
| 引脚 48 | P6.7 — Port 6 bit 7 (digital I/O) |
| 引脚 49 | P7.0 — Port 7 bit 0 (digital I/O) |
| 引脚 50 | P7.1 — Port 7 bit 1 (digital I/O) |
| 引脚 51 | P7.2 — Port 7 bit 2 (digital I/O) |
| 引脚 52 | P7.3 — Port 7 bit 3 (digital I/O) |
| 引脚 53 | P7.4 — Port 7 bit 4 (digital I/O) |
| 引脚 54 | P7.5 — Port 7 bit 5 (digital I/O) |
| 引脚 55 | P7.6 — Port 7 bit 6 (digital I/O) |
| 引脚 56 | P7.7 — Port 7 bit 7 (digital I/O) |
| 引脚 57 | DAC0 — DAC0 analog output |
| 引脚 58 | DAC1 — DAC1 analog output |
| 引脚 59 | CP0+ — Comparator 0 positive input |
| 引脚 60 | CP0- — Comparator 0 negative input |
| 引脚 61 | CP1+ — Comparator 1 positive input |
| 引脚 62 | CP1- — Comparator 1 negative input |
| 引脚 63 | VREF — Voltage reference |
| 引脚 64 | AGND — Analog ground |
| 引脚 65 | AV+ — Analog supply |
| 引脚 66 | XTAL1 — Crystal oscillator input |
| 引脚 67 | XTAL2 — Crystal oscillator output |
| 引脚 68 | RST — Reset (active low) |
| 引脚 69 | TCK — JTAG Test Clock |
| 引脚 70 | TMS — JTAG Test Mode Select |
| 引脚 71 | TDI — JTAG Test Data In |
| 引脚 72 | TDO — JTAG Test Data Out |
| 引脚 73 | P0.0 — Port 0 bit 0 (digital I/O) |
| 引脚 74 | P0.1 — Port 0 bit 1 (digital I/O) |
| 引脚 75 | P0.2 — Port 0 bit 2 (digital I/O) |
| 引脚 76 | P0.3 — Port 0 bit 3 (digital I/O) |
| 引脚 77 | P0.4 — Port 0 bit 4 (digital I/O) |
| 引脚 78 | P0.5 — Port 0 bit 5 (digital I/O) |
| 引脚 79 | P0.6 — Port 0 bit 6 (digital I/O) |
| 引脚 80 | P0.7 — Port 0 bit 7 (digital I/O) |
| 引脚 81 | SDA — I2C data |
| 引脚 82 | SCL — I2C clock |
| 引脚 83 | MOSI — SPI Master Out / Slave In |
| 引脚 84 | MISO — SPI Master In / Slave Out |
| 引脚 85 | SCK — SPI clock |
| 引脚 86 | NSS — SPI slave select |
| 引脚 87 | TX0 — UART0 transmit |
| 引脚 88 | RX0 — UART0 receive |
| 引脚 89 | TX1 — UART1 transmit |
| 引脚 90 | RX1 — UART1 receive |
| 引脚 91 | DGND — Digital ground |
| 引脚 92 | VDD — Digital supply |
| 引脚 93 | NC — Not connected (per datasheet) |
| 引脚 94 | NC — Not connected (per datasheet) |
| 引脚 95 | NC — Not connected (per datasheet) |
| 引脚 96 | NC — Not connected (per datasheet) |
| 引脚 97 | NC — Not connected (per datasheet) |
| 引脚 98 | NC — Not connected (per datasheet) |
| 引脚 99 | NC — Not connected (per datasheet) |
| 引脚 100 | NC — Not connected (per datasheet) |
典型应用
C8051F126-GQR 适用于 6 应用s: Industrial Process Control, Precision Data Acquisition, Motor Control Feedback, Optical Networking Modules, Instrumentation Front-Ends, Automotive Sensor Interfaces.
Industrial Process Control
The C8051F126-GQR is ideal for industrial process control loops where its built-in 10-bit 8-channel 100 ksps SAR ADC with programmable gain amplifier (PGA) gain settings (0.5/1/2/4/8/16) eliminates the need for external signal conditioning. Placed between field sensors (RTD, pressure transducers) and the control loop, it handles analog inputs directly with 2-cycle 16x16 MAC math for PID calculations. The 50 MHz 8051 core delivers up to 100 MIPS peak throughput, sufficient for real-time multi-loop control. Two 12-bit DACs provide analog control outputs for actuators. Unlike a discrete analog-plus-MCU design, it integrates analog silicon density on one die for lower BOM cost.
推荐
Precision Data Acquisition
The C8051F126-GQR's 10-bit 8-channel 100 ksps SAR ADC with programmable throughput up to 100 ksps and dual-redundant 12-bit DACs make it ideal for precision data acquisition systems. Placed at the analog front-end, it provides 16 PGA gain settings (0.5/1/2/4/8/16) and data-dependent windowed interrupt for adaptive acquisition. The 2-cycle 16x16 MAC engine accelerates DSP-style math for FFT and digital filtering. Unlike a discrete analog signal chain, the integrated analog silicon density reduces board space and BOM cost.
推荐
Motor Control Feedback
The C8051F126-GQR's 5 16-bit timers, two 12-bit DAC outputs, and 64 digital I/O pins make it ideal for motor control feedback loops in BLDC, stepper, and DC motor drives. Placed at the feedback inverter stage, it handles analog current/voltage sensing directly via the integrated ADC and provides PWM outputs via the 5 16-bit timers. The 2-cycle 128-bit MAC engine accelerates DSP-style math for FOC and vector control. Unlike a discrete analog-plus-MCU design, it integrates analog silicon density on one die for lower BOM cost.
推荐
Optical Networking Modules
The C8051F126-GQR's 50 MHz 8051 core, 8.25 KB RAM, and 64 digital I/O pins make it ideal for optical networking modules such as SFP, SFP+, and XFP transceivers. Placed at the transceiver controller stage, it handles digital diagnostics monitoring (DDM-via-I2C) and provides alarm/warning interrupt handling. The 100 MIPS peak throughput is sufficient for multi-protocol transceiver communications. The on-chip flash (128KB FIFO) supports in-system firmware upgrades.
推荐
Instrumentation Front-Ends
The C8051F126-GQR's 10-bit 8-channel 100 ksps SAR ADC, dual 12-bit DACs, and 2 analog comparators make it ideal for instrumentation front-ends such as multimeters, oscilloscopes, and signal generators. Placed at the analog front-end, it provides 16 PGA gain settings (0.5/1/2/4/8/16) and data-dependent windowed interrupt for adaptive triggering. The 2-cycle 16x16 MAC engine accelerates DSP-style math for digital filtering. The integrated analog silicon density eliminates the need for external converters.
推荐
Automotive Sensor Interfaces
The C8051F126-GQR's 10-bit 8-channel 100 ksps SAR ADC with PGA, dual 12-bit DACs, and 64 digital I/O pins make it ideal for automotive sensor interfaces. Placed at the analog front-end, it handles analog sensor inputs directly with 16 PGA gain settings (0.5/1/2/4/8/16) and provides data-dependent windowed interrupt for adaptive sampling. The 50 MHz 8051 core delivers up to 100 MIPS peak throughput, sufficient for real-time multi-sensor interfaces. The integrated analog silicon density reduces board space and BOM cost.
推荐
推荐产品汇总
工程参考数据： C8051F126-GQR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | C8051F124-GQR | C8051F125-GQR | C8051F127-GQR | C8051F130-GQR | C8051F131-GQR |
|---|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Silicon Labs | Silicon Labs - same | Silicon Labs - same | Silicon Labs - same | Silicon Labs - same | Silicon Labs - same |
| Core | 8051 (CIP) | 8051 (CIP) - same | 8051 (CIP) - same | 8051 (CIP) - same | 8051 (CIP) - same | 8051 (CIP) - same |
| Maximum Clock Frequency | 50 MHz (100 MIPS) | 50 MHz | 50 MHz | 50 MHz | 100 MHz | 100 MHz |
| Program Memory Size | 128 KB | 64 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| RAM Size | 8.25 KB | 8.25 KB | 8.25 KB | 8.25 KB | 8.25 KB | 8.25 KB |
| ADC | 10-bit, 8-ch, 100 ksps | 10-bit, 8-ch, 100 ksps | 8-bit, 8-ch, 100 ksps | 12-bit, 8-ch, 100 ksps | 10-bit, 8-ch, 100 ksps | 10-bit, 8-ch, 100 ksps |
| DAC | 2 x 12-bit | 2 x 12-bit | 2 x 12-bit | 2 x 12-bit | 2 x 12-bit | 2 x 12-bit |
| Number of I/O Pins | 64 | 64 | 64 | 64 | 64 | 64 |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
关键差异点
- Highest flash density in the same TQFP-100 footprint （对比 C8051F124-GQR)
- Higher ADC resolution than the same family （对比 C8051F125-GQR)
- Higher ADC resolution than the same family （对比 C8051F127-GQR)
设计说明
The C8051F126-GQR operates from a 2.7 V to 3.6 V supply, with 3.3 V being the nominal design point. Place a 10 uF bulk capacitor and a 0.1 uF ceramic decoupling capacitor as close to the VDD pin as possible. The analog supply (AV+) should be filtered separately from the digital supply to reduce digital switching noise coupling into the analog section. According to the Silicon Labs datasheet, the on-chip voltage reference requires a 0.1 uF + 10 uF capacitor combination on the VREF pin for proper operation. System designers should keep the power budget in mind for low-noise modes.
Place decoupling capacitors (0.1 uF ceramic + 10 uF bulk) on each VDD pin as close to the IC as possible. Use a continuous ground plane under the IC for thermal dissipation and noise immunity. Route analog signals (P5.x, DAC0/1, comparator inputs) away from digital switching signals. The exposed thermal pad on the bottom of the TQFP package should be soldered to the ground plane for optimal thermal performance. According to the Silicon Labs datasheet, the layout should follow the reference design pattern for proper mixed-signal operation. System designers should keep the trace impedance in mind for high-speed modes.
Do not exceed the absolute maximum supply voltage of 3.6 V on VDD. Do not apply analog input voltages outside the AGNC (per datasheet) range to the analog ADC ports (P5.x). Ensure that the RST pin is pulled high with an external 10 kohm resistor for proper reset operation. The on-chip PLL requires a valid XTAL1 clock for proper lock. According to the Silicon Labs datasheet, the original code's flash legacy requires proper flash programming sequence for portable migration. System designers should check the errata sheet for known silicon issues.
合规信息
RoHS compliant per Silicon Labs product page. Not AEC-Q100 qualified. Lead-free per -GQR suffix. Halogen-free status not explicitly stated in provided data.
